A system for dual chirp modulation includes a transmission unit, a receiving unit, and a transmission channel. A modulation module of the transmission unit is configured to receive binary data and modulate the binary data by a first dual chirp sequence and a second dual chirp sequence for generating an output signal. Then the output signal is converted from digital form to analog form by a digital to analog converter. A transmission channel is configured to receive the output signal converted to analog form, wherein the output signal converted to analog folio passes the transmission channel for generating a received signal. An analog to digital converter converts the received signal from analog form to digital form and a demodulation module demodulates the received signal with digital form, by the first dual chirp sequence and the second dial chirp sequence, for recovering the binary data.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A dual chirp modulation system, comprising: a transmission unit, comprising: a modulation module, configured to receive binary data and modulate the binary data by a first chirp sequence and a second chirp sequence for generating an output signal; and a digital to analog converter, converting the output signal from digital form to analog form; a transmission channel, receiving the output signal converted to analog form, wherein the output signal converted to analog form passes the transmission channel to generate a receipt signal; and a receiving unit, comprising: an analog to digital converter, configured to convert the received signal from analog form to digital form; and a demodulation module, configured to demodulate the receipt signal, which is converted to digital form, by the first chirp sequence and the second chirp sequence, for recovering the binary data.
2. The system of claim 1 , wherein the first chirp sequence is indicative that the binary data is 0 and a second chirp sequence is indicative that the binary data is 1.
3. The system of claim 1 , wherein the modulation module comprises: a first multiplier, configured to multiply the binary data and the first chirp sequence to generate a first modulated signal; an inverter, inverting the binary data to generate inverted binary data; a second multiplier, configured to multiply the inverted binary data and the second chirp sequence to generate a second modulated signal; and an accumulator, receiving the first modulated signal and the second modulated signal for generating the output signal.
4. The system of claim 1 , wherein the demodulation module comprises: a first correlator, configured to multiply the receipt signal and the first chirp sequence, accumulate the multiplied product produced thereof and measure the absolute value of the multiplied product, for generating a first demodulated signal; a second correlator, configured to multiply the received signal and the second dual chirp sequence, accumulate the multiplied product produced thereof and measure the absolute value of the multiplied product, for generating a second demodulated signal; a subtractor, configured to subtract the second demodulated signal from the first demodulated signal; and a decision device, configured to recover the binary data according to a subtracted difference from the subtractor.
5. The system of claim 1 , wherein the transmission channel is a power line channel.
6. A dual chirp modulation method, comprising the steps of: modulating binary data by a first chirp sequence and a second chirp sequence for generating an output signal; converting the output signal from digital form to analog form; receiving the output signal converted to analog form through a transmission channel, wherein the output signal converted to analog form passes the transmission channel to generate a receipt signal; converting the receipt signal from analog form to digital form; and demodulating the receipt signal, which is converted to digital form, by the first chirp sequence and the second chirp sequence, for recovering the binary data.
7. The method of claim 6 , wherein the first chirp sequence is indicative that the binary data is 0 and a second chirp sequence is indicative that the binary data is 1.
8. The method of claim 6 , further comprising the steps of: multiplying the binary data and the first chirp sequence by a first multiplier to generate a first modulated signal; multiplying an inverted version of the binary data and the second chirp sequence by a second multiplier for generating a second modulated signal; and accumulating the first modulated signal and the second modulated signal by an accumulator to generate an output signal.
9. The method of claim 6 , further comprising the steps of: multiplying the receipt signal and the first chirp sequence, accumulating the multiplied product produced thereof and measuring the absolute value of the multiplied product, by a first correlator to generate a first demodulated signal; multiplying the receipt signal and the second chirp sequence, accumulating the multiplied product produced thereof and measuring the absolute value of the multiplied product, by a second correlator to generate a second demodulated signal; subtracting the second demodulated signal from the first demodulated signal by a subtractor; and recovering the binary data by a decision device according to a subtracted difference from the subtractor.
10. The method of claim 6 , wherein the transmission channel is a power line channel.
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March 15, 2013
August 5, 2014
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